diff --git a/core/misc.cpp b/core/misc.cpp
index ee7534f..30646f7 100755
--- a/core/misc.cpp
+++ b/core/misc.cpp
@@ -622,11 +622,11 @@ std::wstring::size_type i;
 }
 
 
-
-bool IsEmailCorrectChar(wchar_t c)
-{
-bool correct = false;
-
+
+bool IsEmailCorrectChar(wchar_t c)
+{
+bool correct = false;
+
 	const wchar_t * allowed_chars = L"@.!#$%&'*+-/=?^_`{|}~";
 
 	if(	(c >= 'A' && c<='Z') ||
@@ -646,12 +646,12 @@ bool correct = false;
 			}
 		}
 	}
-
-return correct;
-}
-
-
-
+
+return correct;
+}
+
+
+
 bool ValidateEmail(const wchar_t * email)
 {
 	int at				= 0;	// how many '@'
@@ -674,13 +674,13 @@ bool ValidateEmail(const wchar_t * email)
 	
 return true;
 }
-
-
+
+
 bool ValidateEmail(const std::wstring & email)
 {
-	return ValidateEmail(email.c_str());
-}
-
+	return ValidateEmail(email.c_str());
+}
+
 
 
 
diff --git a/core/misc.h b/core/misc.h
index 1c7a570..7f62fae 100755
--- a/core/misc.h
+++ b/core/misc.h
@@ -258,6 +258,42 @@ void MaxSize(StringType & str, size_t max_size)
 
 
 
+/*
+	this method removing all characters from given string
+	only digits are allowed and if allow_comma then one comma (or dot) 
+	character is allowed
+*/
+template<class StringType>
+void OnlyDigit(StringType & s, bool allow_comma = true)
+{
+typename StringType::size_type i;
+bool was_comma = false;
+
+	if( s.empty() )
+	{
+		s = '0';
+		return;
+	}
+	
+	for(i=0 ; i<s.size() ; )
+	{
+		if( (s[i]>='0' && s[i]<='9') ||
+			(allow_comma && !was_comma && (s[i]=='.' || s[i]==',')) )
+		{
+			if( s[i]=='.' || s[i]==',' )
+				was_comma = true;
+
+			i += 1;
+		}
+		else
+		{
+			s.erase(i, 1);
+		}
+	}
+}
+
+
+
 wchar_t ToSmall(wchar_t c);
 void ToSmall(std::wstring & s);